Hypothyroid with normal blood work?

My T4, TSH, thyroid antibody tests are all within normal range. I have most of the symptoms of hypothyroid condition (pretibial edema, hair loss, fatigue, difficulty losing weight, hoarseness). My cortisol is normal but my DHEA is too low to measure. I have been taking a supplement of DHEA for about six months. Level is normal for my age (66). My thyroid appears to be normal by palpation. At age 3 I was treated with radiation for remaining tonsillar tissue after tonsillectomy. I was given an accidental overdose and was told that it caused severe pain. Is it possible to have thyroid disease given all the normal blood work?

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